<template>
  <div id="app">
    <ul>
      <li v-for="(item, index) in myArr" :key="index">{{ item }}</li>
    </ul>
    <button @click="sj">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr: ['帅哥', '美女', '程序猿']
    }
  },
  methods: {
    sj() {
      let before = this.myArr[0]
      this.myArr.shift()

      this.myArr.push(before)
    }
  }
}
</script>
